[gnome-games] gamepad: Add RawGamepadMonitor interface

[Adrien Plazas <aplazas src gnome org>]

commit 6459adeec22ebdb2fa5e5f1d4a3539e40c40cc17
Author: Megh Parikh <meghprkh gmail com>
Date:   Mon Jul 18 20:02:14 2016 +0530

    gamepad: Add RawGamepadMonitor interface
    
    This is the interface implemented by a driver that acts as a monitor to
    the currently plugged in RawGamepads.
    
    This is part of a series of commits to add gamepad support.

 src/Makefile.am                      |    1 +
 src/gamepad/raw-gamepad-monitor.vala |   18 ++++++++++++++++++
 2 files changed, 19 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 19fcfac..08ee53b 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -55,6 +55,7 @@ gnome_games_SOURCES = \
        \
        gamepad/gamepad-callbacks.vala \
        gamepad/raw-gamepad.vala \
+       gamepad/raw-gamepad-monitor.vala \
        \
        grilo/grilo-cover.vala \
        grilo/grilo-media.vala \
diff --git a/src/gamepad/raw-gamepad-monitor.vala b/src/gamepad/raw-gamepad-monitor.vala
new file mode 100644
index 0000000..2aab186
--- /dev/null
+++ b/src/gamepad/raw-gamepad-monitor.vala
@@ -0,0 +1,18 @@
+// This file is part of GNOME Games. License: GPLv3
+
+/**
+ * This is one of the interfaces that needs to be implemented by the driver.
+ */
+private interface Games.RawGamepadMonitor : Object {
+       /**
+        * This signal should be emmited when a gamepad is plugged in.
+        * @param   raw_gamepad   The raw gamepad
+        */
+       public abstract signal void gamepad_plugged (RawGamepad raw_gamepad);
+
+       /**
+        * This function allows to iterate over all gamepads
+        * @param   callback            The callback
+        */
+       public abstract void foreach_gamepad (RawGamepadCallback callback);
+}